Basic Studies relating to the Transference of Genetic Characters From Triticum Monococcum L. to Hexaploid Wheat

The, T. T.; Baker, E. P.

doi:10.1071/bi9750189

Cited by 28 publications

(15 citation statements)

References 8 publications

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“…The suppression of resistance to cereal rusts carried by H. chilense seems rather lo be due to intergenomic interaction. Similar cases of suppression of resistance have been described in cereal amphiploids (Quinones e( at,, 1972;The & Baker, 1975;Kerber & Green, 1980;Kerber, 1983;Chevre et at,, 1989) as well as in barley addition lines in wheat (Shepherd & Johnson, 1982). Nevertheless, H, chitense resistance to Septoria tritici (Rubiales et at,, 1992a), to Erysiphe graminis (D.R.. unpublished data) and to Metoidogyne naasi (Person-Dedry \ er et at,, 1990) is expressed in tritordeum and there is a dilution of resistance at higher ploidy levels.…”

Section: Discussionsupporting

confidence: 56%

Histology of the infection of tritordeum and its parents by cereal brown rusts

et al. 1993

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The reactions of tritordeum lines and their Hordeum chilense and Triticum spp. parents to infection by Puccinia recondita f.sp. tritici, P. recondita f.sp. agropyri and P. hordei were studied at the seedling stage. The histological observations indicated that tritordeum behaves as the wheat parent, whatever the H. chilense parental line reaction. Tritordeum is to be considered a host of wheat brown rust where genes for hypersensitive resistance may occur; these are apparently contributed by the wheat parent. Both H. chilense and wheat are highly resistant to barley brown rust, and the reaction of tritordeum is that of the wheat parent with respect to the levels of necrosis associated with the early aborted infection units. The tritordeum reaction is also that of the wheat parent to a rust collected on H. jubatum (putatively P. recondita f.sp. agropyri), with the susceptibility or resistance of H. chilense being overruled by the wheat parent reaction.

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Section: Discussionsupporting

confidence: 56%

Histology of the infection of tritordeum and its parents by cereal brown rusts

et al. 1993

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“…Interaction between the genomes in allopolyploid wheat is associated with the reduction or loss (suppression) of resistance to fungal plant pathogens causing stem rust [11][12][13] , leaf rust 11,14,15 , stripe rust 16 , and powdery mildew 17,18 . One constraint in wheat breeding is the suppression of stem rust resistance (Sr) genes when transferred from diploid and tetraploid ancestors to hexaploid wheat [11][12][13][14][15][19][20][21][22] . Suppression of stem rust resistance was first reported in 1980 when it was discovered that the loss of the D genome chromosomes activated resistance to several Pgt races that were virulent to the hexaploid wheat cultivar "Canthatch" (CTH) 23 .…”

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confidence: 99%

Stem rust resistance in wheat is suppressed by a subunit of the mediator complex

et al. 2020

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Stem rust is an important disease of wheat that can be controlled using resistance genes. The gene SuSr-D1 identified in cultivar 'Canthatch' suppresses stem rust resistance. SuSr-D1 mutants are resistant to several races of stem rust that are virulent on wild-type plants. Here we identify SuSr-D1 by sequencing flow-sorted chromosomes, mutagenesis, and map-based cloning. The gene encodes Med15, a subunit of the Mediator Complex, a conserved protein complex in eukaryotes that regulates expression of protein-coding genes. Nonsense mutations in Med15b.D result in expression of stem rust resistance. Time-course RNAseq analysis show a significant reduction or complete loss of differential gene expression at 24 h post inoculation in med15b.D mutants, suggesting that transcriptional reprogramming at this time point is not required for immunity to stem rust. Suppression is a common phenomenon and this study provides novel insight into suppression of rust resistance in wheat.

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“…The failure of the substitution line to locate the gene in accession 104 on chromosome 1A could be attributed to a suppressor gene present in the D-genome chromosome of the substitution line 1D1A. There are reports indicating that substituted Dgenome of wheat may affect expression of leaf rust resistance genes present on the A-or B-genomes (The & Baker, 1975;Kerber, 1983;Dyck, 1987;Bai & Knott, 1992). Konzak & Joppa (1988) further demonstrated that the D-genome chromosomes in the substitution Table 4.…”

Section: Discussionmentioning

confidence: 90%